MONTEREY — The hottest day so far this year is expected to hit the Bay Area on Saturday, with temperatures soaring into the 90s across much of the region and likely reaching triple digits in some inland locations, according to the National Weather Service in Monterey.

Some of the hottest locations will be in the inland East Bay, where cities such as Antioch, Brentwood and Livermore may flirt with 105 degrees, said Scott Rowe, a meteorologist with the weather service.

Depending where you are in San Jose, temperatures could reach 100 degrees, Rowe said. Cities along the Highway 101 corridor — including Santa Clara, Sunnyvale and Mountain View — all could hit triple digits.

The weather service has issued a heat advisory for inland areas from 11 a.m. to 8 p.m., warning that people could be affected by the soaring temperatures if precautions aren’t taken.

“If folks are traveling around the Bay Area, remain hydrated,” Rowe said. “Recognize the symptoms of heat exhaustion and help your neighbors.”

According to the Centers for Disease Control and Prevention, symptoms of heat exhaustion include headache, nausea, dizziness, weakness, irritability, thirst, heavy sweating, elevated body temperature and decreased urine output.

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Bay Area residents seeking cooler locations might want to head for the coast, where temperatures will be 25 to 30 degrees cooler, according to the weather service. Forecast highs for Saturday include 73 degrees in Monterey, 75 in Half Moon Bay and 77 in Santa Cruz.

“It’s a pick your microclimate kind of weekend,” Rowe said.

The warm temperatures, coupled with low humidity and gusty winds, also have led the weather service to issue a red-flag warning for the North Bay mountains, East Bay hills and the Diablo range.

“We’re asking folks to be mindful and not have any open flames during that time because any fires that start could spread rather rapidly,” Rowe said.

Friday offered a preview of what’s to come.

Will Pi, a meteorologist with the weather service, said Concord recorded a high of 102 degrees, making it the hottest spot in the Bay Area. Elsewhere, the mercury peaked at 99 in Livermore, 97 in Gilroy, 92 in San Rafael, 89 in San Jose, 79 in Oakland and 71 in downtown San Francisco.

Jason Green is a breaking news reporter for the Bay Area News Group. He works week nights and spends most of his time covering crime and public safety. A graduate of UC Santa Barbara and the University of Southern California, he cut his teeth at the Inland Valley Daily Bulletin and the Palo Alto Daily News, and has been with the Bay Area News Group since its inception.